So I have a finished beer that came out OK... I'd like to add a little more hop bite to it... Is it possible/advisable to add bag of hops to a serving keg already in a kegerator? In a sense, dry hopping a already finished beer... Thanks.

I don't pull mine out after 7 days- they stay in until the keg is empty. It turns out great! You will want to make sure you use a sanitized hops bag of course, because you don't want to clog up your dip tube.

__________________Broken Leg BreweryGiving beer a leg to stand on since 2006

I love the idea of a randall, too! I keep saying I'm going to build one but never do.

I think there are a couple of reasons for the debate on 7 days vs the entire keg life. One is that I've heard that leaving beer on the dryhops longer than 10-14 days or so can impart "grassy" flavors. That may be true at room temperature. In my experience, though, dryhopping in the keg at fridge temps, that does not happen and it actually takes longer than 7 days to get the full effect of the dryhopping. It's a temperature thing. If your keg is at room temperature, it's probably different than at fridge temps. I've never dryhopped in the keg at room temperature longer than a few days.

It would be interesting to hear from people who did dryhop in the keg for longer than 7 days and DID get some grassy flavors. I've never really heard from the other side on this issue.

__________________Broken Leg BreweryGiving beer a leg to stand on since 2006

Grassy flavors with dry hopping have only happened to me in the first few days of kegging. After a week everything settles out and it stays 1-2 months depending on keg life.

BM - marbles was my original method until I read about lead in China glass marbles. I don't have a source of the info, but now I use the SS doohicky from my Sanke spears as the weights. And if you are zip tying to the dip tube, don't see why you need the weights at all. I zip tie fishing line to the underside stub of the PRV of the keg lid.